Message Flow (BPM)

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Message Flows are used to show the flow of messages between two participants that are prepared to send and receive them. A Message Flow can connect directly to the boundary of a pool or it can cross the boundary of a pool and connect to an object within that pool. Also, if there is an Expanded Sub-Process in one of the Pools, then the Message Flow can be connected to either the boundary of the Sub-Process or to objects within the Sub-Process. The following example shows a Message Flow across the boundary of a pool.